M29W640FT datasheet(26/71 Pages) NUMONYX

Part #	M29W640FT

Description	64 Mbit (8Mb x8 or 4Mb x16, Page, Boot Block) 3V Supply Flash Memory

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Manufacturer	NUMONYX [Numonyx B.V]

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Command interface

M29W640FT, M29W640FB

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4.3

Block Protection commands

4.3.1

Enter Extended Block command

The device has an extra 256 Byte block (Extended Block) that can only be accessed using

the Enter Extended Block command. Three Bus write cycles are required to issue the

Extended Block command. Once the command has been issued the device enters

Extended Block mode where all Bus Read or Write operations to the Boot Block addresses

access the Extended Block. The Extended Block (with the same address as the Boot

Blocks) cannot be erased, and can be treated as one-time programmable (OTP) memory. In

Extended Block mode the Boot Blocks are not accessible.

To exit from the Extended Block mode the Exit Extended Block command must be issued.

The Extended Block can be protected, however once protected the protection cannot be

undone.

4.3.2

Exit Extended Block command

The Exit Extended Block command is used to exit from the Extended Block mode and return

the device to Read mode. Four Bus Write operations are required to issue the command.

4.3.3

Block Protect and Chip Unprotect commands

Groups of blocks can be protected against accidental Program or Erase. The Protection

Groups are shown in Appendix A: Block addresses, Table 21: Top Boot Block addresses,

M29W640FT and Table 22: Bottom Boot Block addresses, M29W640FB. The whole chip

can be unprotected to allow the data inside the blocks to be changed.

Block Protect and Chip Unprotect operations are described in Appendix D: Block protection.

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